Boost converter with 5A integrated switch
The TPS61281AYFFR is a synchronous step-up (boost) DC-DC converter from Texas Instruments, integrating a 5A switch in a 16-bump DSBGA package (1.67×1.67 mm). It accepts an input from 2.3 V to 4.85 V and delivers a programmable output between 2.85 V and 4.4 V at a fixed 2.3 MHz switching frequency.
Input and output voltage boundaries
The 2.3 V minimum input suits single-cell Li-ion or two-cell alkaline applications; the 4.85 V maximum input covers USB and regulated 5 V rails. The programmable output range tops out at 4.4 V, so this part cannot deliver a regulated 5 V output — designs requiring 5 V need a different boost topology or a SEPIC. The 2.3 MHz switching frequency allows small inductor and capacitor values.
Sourcing reality: obsolete, sourced to order
Availability is limited to independent-distribution stock and surplus channel inventory.